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authorYousong Zhou <yszhou4tech@gmail.com>2020-03-24 23:27:51 +0800
committerThomas Bogendoerfer <tsbogend@alpha.franken.de>2020-03-25 16:07:14 +0100
commitaebdc6ff3b2e79327d8eff7c0e2d835bb1d3221f (patch)
tree552a6b0f7ecd3f37dc938ec704f84f53835858e1 /arch/mips/kernel
parentd191aaffe3687d1e73e644c185f5f0550ec242b5 (diff)
downloadlinux-aebdc6ff3b2e79327d8eff7c0e2d835bb1d3221f.tar.bz2
MIPS: Exclude more dsemul code when CONFIG_MIPS_FP_SUPPORT=n
This furthers what commit 42b10815d559 ("MIPS: Don't compile math-emu when CONFIG_MIPS_FP_SUPPORT=n") has done Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/kernel')
-rw-r--r--arch/mips/kernel/process.c10
-rw-r--r--arch/mips/kernel/vdso.c26
2 files changed, 23 insertions, 13 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 339870ed92f7..b2a797557825 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -75,7 +75,9 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
lose_fpu(0);
clear_thread_flag(TIF_MSA_CTX_LIVE);
clear_used_math();
+#ifdef CONFIG_MIPS_FP_SUPPORT
atomic_set(&current->thread.bd_emu_frame, BD_EMUFRAME_NONE);
+#endif
init_dsp();
regs->cp0_epc = pc;
regs->regs[29] = sp;
@@ -176,7 +178,9 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
clear_tsk_thread_flag(p, TIF_FPUBOUND);
#endif /* CONFIG_MIPS_MT_FPAFF */
+#ifdef CONFIG_MIPS_FP_SUPPORT
atomic_set(&p->thread.bd_emu_frame, BD_EMUFRAME_NONE);
+#endif
if (clone_flags & CLONE_SETTLS)
ti->tp_value = tls;
@@ -650,8 +654,10 @@ unsigned long mips_stack_top(void)
{
unsigned long top = TASK_SIZE & PAGE_MASK;
- /* One page for branch delay slot "emulation" */
- top -= PAGE_SIZE;
+ if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) {
+ /* One page for branch delay slot "emulation" */
+ top -= PAGE_SIZE;
+ }
/* Space for the VDSO, data page & GIC user page */
top -= PAGE_ALIGN(current->thread.abi->vdso->size);
diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c
index bc35f8499111..3adb7354bc01 100644
--- a/arch/mips/kernel/vdso.c
+++ b/arch/mips/kernel/vdso.c
@@ -71,10 +71,12 @@ subsys_initcall(init_vdso);
static unsigned long vdso_base(void)
{
- unsigned long base;
+ unsigned long base = STACK_TOP;
- /* Skip the delay slot emulation page */
- base = STACK_TOP + PAGE_SIZE;
+ if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) {
+ /* Skip the delay slot emulation page */
+ base += PAGE_SIZE;
+ }
if (current->flags & PF_RANDOMIZE) {
base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1);
@@ -95,14 +97,16 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
if (down_write_killable(&mm->mmap_sem))
return -EINTR;
- /* Map delay slot emulation page */
- base = mmap_region(NULL, STACK_TOP, PAGE_SIZE,
- VM_READ | VM_EXEC |
- VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
- 0, NULL);
- if (IS_ERR_VALUE(base)) {
- ret = base;
- goto out;
+ if (IS_ENABLED(CONFIG_MIPS_FP_SUPPORT)) {
+ /* Map delay slot emulation page */
+ base = mmap_region(NULL, STACK_TOP, PAGE_SIZE,
+ VM_READ | VM_EXEC |
+ VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC,
+ 0, NULL);
+ if (IS_ERR_VALUE(base)) {
+ ret = base;
+ goto out;
+ }
}
/*